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examples/audiopanning: fix the initial panning

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This commit is contained in:
Hajime Hoshi 2023-03-14 21:30:55 +09:00
parent 84a86c86e4
commit 3951df05c8
1 changed files with 9 additions and 5 deletions
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14
examples/audiopanning/main.go
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@ -56,7 +56,7 @@ type Game struct {
audioContext *audio.Context
}
func (g *Game) initAudio() {
func (g *Game) initAudioIfNeeded() {
if g.player != nil {
return
}
@ -73,7 +73,8 @@ func (g *Game) initAudio() {
}
// Wrap the raw audio with the StereoPanStream
g.panstream = NewStereoPanStreamFromReader(audio.NewInfiniteLoop(oggS, oggS.Length()))
g.panstream = NewStereoPanStream(audio.NewInfiniteLoop(oggS, oggS.Length()))
g.panstream.SetPan(g.panning)
g.player, err = g.audioContext.NewPlayer(g.panstream)
if err != nil {
@ -90,12 +91,15 @@ func lerp(a, b, t float64) float64 {
}
func (g *Game) Update() error {
g.initAudio()
g.count++
r := float64(g.count) * ((1.0 / 60.0) * 2 * math.Pi) * 0.1 // full cycle every 10 seconds
g.xpos = (float64(screenWidth) / 2) + math.Cos(r)*(float64(screenWidth)/2)
g.panning = lerp(-1, 1, g.xpos/float64(screenWidth))
// Initialize the audio after the panning is determined.
g.initAudioIfNeeded()
g.panstream.SetPan(g.panning)
return nil
}
@ -189,12 +193,12 @@ func (s *StereoPanStream) Pan() float64 {
return s.pan
}
// NewStereoPanStreamFromReader returns a new StereoPanStream with a buffered src.
// NewStereoPanStream returns a new StereoPanStream with a buffered src.
//
// The src's format must be linear PCM (16bits little endian, 2 channel stereo)
// without a header (e.g. RIFF header). The sample rate must be same as that
// of the audio context.
func NewStereoPanStreamFromReader(src io.ReadSeeker) *StereoPanStream {
func NewStereoPanStream(src io.ReadSeeker) *StereoPanStream {
return &StereoPanStream{
ReadSeeker: src,
}